Gasification: Species Tab

Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table also displays their default values and their generally acceptable range. Note that due to how the variables are used in the modeling equations, the range of acceptable values may be further reduced; for more details, see Gasification: Modeling Assumptions & Constraints.

Variable	Default Value	Range

○ Oxygen Indicates the pure component that is associated with the oxygen species. Click on the list box to bring up a list of available components in order to select one.	<Oxygen>	Any Pure Component
○ Water Indicates the pure component that is associated with the water species. Click on the list box to bring up a list of available components in order to select one.	<Water>	Any Pure Component
○ Nitrogen Indicates the pure component that is associated with the nitrogen species. Click on the list box to bring up a list of available components in order to select one.	<Nitrogen>	Any Pure Component
○ Hydrogen Indicates the pure component that is associated with the hydrogen species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Carbon Monoxide Indicates the pure component that is associated with the carbon monoxide species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Carbon Dioxide Indicates the pure component that is associated with the carbon dioxide species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Methane Indicates the pure component that is associated with the methane species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Hydrogen Sulfide Indicates the pure component that is associated with the hydrogen sulfide species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Ash Indicates the pure component that is associated with the ash species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component
○ Carbon Indicates the pure component that is associated with the carbon species. Click on the list box to bring up a list of available components in order to select one.	<none>	Any Pure Component

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Specification Choices / Comments

The following list describes the available specification choices in this tab; for more details on how these are implemented, see Gasification: Modeling Calculations:

You should specify a suitable pure component for each species present in the input or output streams (e.g., reacting oxygen, water in the form of moisture or water vapor, nitrogen in air, produced hydrogen, produced carbon monoxide, produced carbon dioxide, produced methane, produced hydrogen sulfide, fuel ash, and unconverted carbon).

Before using this tab, you may need to register suitable pure components for hydrogen, carbon monoxide, carbon dioxide, methane, hydrogen sulfide, ash, and carbon; for more details on how to register a pure component, see Pure Component Registration.

•Oxygen, Water, and Nitrogen...

Suitable pure components are pre-selected for these elements from the list of registered pure components.

•Hydrogen, Carbon Monoxide, Carbon Dioxide and Methane...

You must specify suitable pure components for these species.

•Hydrogen Sulfide...

You only need to specify a pure component for hydrogen sulfide if at least one fuel component contains sulfur (see Fuel Conversion: Fuel Tab).

•Ash...

You only need to specify a pure component for ash if at least one fuel component contains ash (see Steam Generation: Elemental Composition Tab).